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Wed, 22 Jul 2020 09:44:58 -0700 (PDT) From: David Brazdil To: Catalin Marinas , Will Deacon , Marc Zyngier , Dennis Zhou , Tejun Heo , Christoph Lameter , Arnd Bergmann Subject: [PATCH 0/9] Independent per-CPU data section for nVHE Date: Wed, 22 Jul 2020 17:44:15 +0100 Message-Id: <20200722164424.42225-1-dbrazdil@google.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200722_124502_262736_1B128BA1 X-CRM114-Status: GOOD ( 12.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Suzuki K Poulose , linux-kernel@vger.kernel.org, kernel-team@google.com, James Morse , Julien Thierry , David Brazdil , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Introduce '.hyp.data..percpu' as part of ongoing effort to make nVHE hyp code self-contained and independent of the rest of the kernel. The series builds on top of the "Split off nVHE hyp code" series which used objcopy to rename '.text' to '.hyp.text' and prefix all ELF symbols with '__kvm_nvhe' for all object files under kvm/hyp/nvhe. The series is structured as follows: - patch 1: Modify generic PERCPU_* linker script macros to make it possible to define multiple per-CPU ELF sections with prefixed section and symbol names. - patches 2-3: Replace hyp helpers for accessing per-CPU variables with common helpers modified to work correctly in hyp. Per-CPU variables can now be accessed with one API anywhere. - patches 4-6: Where VHE and nVHE use per-CPU variables defined in kernel proper, move their definitions to hyp/ where they are duplicated and owned by VHE/nVHE, respectively. Non-VHE hyp code now refers only to per-CPU variables defined in its source files. Helpers are added so that kernel proper can continue to access nVHE hyp variables, same way as it does with other nVHE symbols. - patches 7-9: Introduce '.hyp.data..percpu' ELF section and allocate memory for every CPU core during KVM init. All nVHE per-CPU state is now grouped together in ELF and in memory. Introducing a new per-CPU variable does not require adding new memory mappings any more. nVHE hyp code cannot accidentally refer to kernel-proper per-CPU data as it only has the pointer to its own per-CPU memory. The patches are rebased on current kvmarm/next (commit b72eb1f6813) and are available in branch 'topic/percpu' at: https://android-kvm.googlesource.com/linux David Brazdil (9): Macros to override naming of percpu symbols and sections kvm: arm64: Remove __hyp_this_cpu_read kvm: arm64: Remove hyp_adr/ldr_this_cpu kvm: arm64: Add helpers for accessing nVHE hyp per-cpu vars kvm: arm64: Duplicate arm64_ssbd_callback_required for nVHE hyp kvm: arm64: Create separate instances of kvm_host_data for VHE/nVHE kvm: arm64: Mark hyp stack pages reserved kvm: arm64: Set up hyp percpu data for nVHE kvm: arm64: Remove unnecessary hyp mappings arch/arm64/include/asm/assembler.h | 27 ++++-- arch/arm64/include/asm/kvm_asm.h | 74 ++++++++------- arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/include/asm/kvm_mmu.h | 23 ++--- arch/arm64/include/asm/percpu.h | 33 ++++++- arch/arm64/include/asm/sections.h | 1 + arch/arm64/kernel/image-vars.h | 2 - arch/arm64/kernel/vmlinux.lds.S | 10 ++ arch/arm64/kvm/arm.c | 110 ++++++++++++++++++---- arch/arm64/kvm/hyp/hyp-entry.S | 2 +- arch/arm64/kvm/hyp/include/hyp/debug-sr.h | 4 +- arch/arm64/kvm/hyp/include/hyp/switch.h | 6 +- arch/arm64/kvm/hyp/nvhe/Makefile | 2 + arch/arm64/kvm/hyp/nvhe/switch.c | 8 +- arch/arm64/kvm/hyp/vhe/switch.c | 5 +- arch/arm64/kvm/hyp/vhe/sysreg-sr.c | 4 +- arch/arm64/kvm/pmu.c | 13 ++- include/asm-generic/vmlinux.lds.h | 40 +++++--- 18 files changed, 257 insertions(+), 109 deletions(-) -- 2.27.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel